Txoj kev tu thiab kev txawj ntse ntawm digital multimeter
Cov ntsuas hluav taws xob muaj qhov ua tau zoo thiab raug, thiab siv nyob rau hauv yuav luag txhua lub lag luam. Txawm li cas los xij, vim muaj ntau yam ntawm nws qhov tsis ua haujlwm, thiab qhov tsis sib xws ntawm cov teeb meem tau ntsib, tsis muaj ntau txoj cai ua raws, thiab nws nyuaj rau kho. Yog li ntawd, kuv tau txheeb xyuas qee qhov kev txhim kho uas tau sau tseg hauv kev ua haujlwm tau ntau xyoo rau kev siv ntawm cov npoj yaig koom nrog hauv txoj haujlwm no.
1. Kho txoj kev
Nrhiav qhov txhaum yuav tsum ua ntej ntawm sab nraud ua ntej sab hauv, los ntawm qhov yooj yim mus rau qhov nyuaj. Cov txheej txheem tuaj yeem kwv yees faib ua pawg hauv qab no:
(1) Tus txheej txheem sensory ncaj qha txiav txim qhov ua rau qhov tsis ua hauj lwm los ntawm kev nkag siab. Los ntawm kev soj ntsuam pom, nws tuaj yeem pom xws li kev sib txuas, de-soldering, luv Circuit Court ntawm cov hlau, tawg fuse tube, hlawv tawm cov khoom, kev puas tsuaj, thiab tooj liab ntawv ci ntawm cov ntawv luam tawm. Lifting thiab tawg, thiab lwm yam; Qhov kub nce ntawm cov roj teeb, cov resistors, transistors, thiab kev sib xyaw ua ke tuaj yeem kov tau, thiab qhov ua rau ntawm qhov kub tsis zoo tuaj yeem pom los ntawm kev xa mus rau daim duab kos duab. Tsis tas li ntawd, koj tuaj yeem tshawb xyuas los ntawm txhais tes seb cov khoom puas yog xoob, seb cov pins sib xyaw ua ke tau ruaj khov, thiab seb qhov hloov pauv hloov yog cassette; koj tuaj yeem hnov thiab hnov txog seb puas muaj lub suab txawv txav lossis tsis hnov tsw.
(2) Txoj kev ntsuas qhov ntsuas hluav taws xob ntsuas seb qhov ua haujlwm voltage ntawm txhua qhov tseem ceeb yog qhov qub, qhov txhaum taw tes tuaj yeem pom sai. Xws li ntsuas qhov ua haujlwm voltage ntawm A / D converter, siv voltage, thiab lwm yam.
(3) Short-circuit method The short-circuit method feem ntau yog siv rau hauv txoj kev tshawb xyuas A/D converter hais los saum no. Txoj kev no yog siv ntau dua thaum kho cov twj tsis muaj zog thiab micro-hluav taws xob.
(4) Txoj kev rhuav tshem Circuit Court Disconnect qhov tsis txaus ntseeg los ntawm tag nrho lub tshuab lossis chav tsev Circuit Court. Yog hais tias qhov txhaum ploj mus, nws txhais tau hais tias qhov txhaum nyob rau hauv lub disconnected Circuit Court. Txoj kev no feem ntau yog tsim rau luv luv Circuit Court.
(5) Kev ntsuas kev tivthaiv Thaum qhov ua txhaum raug txo mus rau ib qho chaw lossis ob peb yam, nws tuaj yeem ntsuas hauv online lossis offline. Yog tias tsim nyog, hloov nrog cov khoom zoo. Yog tias qhov txhaum ploj mus, cov khoom tawg.
(6) Txoj kev cuam tshuam Cov tib neeg lub cev induced voltage yog siv los ua lub teeb liab cuam tshuam los soj ntsuam cov kev hloov ntawm cov kua siv lead ua kua zaub, uas feem ntau yog siv los xyuas seb lub input Circuit Court thiab cov khoom siv nyob rau hauv zoo.
2. Kho kev txawj ntse
Rau cov cuab yeej faulty, thawj zaug xyuas thiab txiav txim siab seb qhov kev ua txhaum tshwm sim puas muaj tshwm sim (tag nrho cov haujlwm tsis tuaj yeem ntsuas tau) lossis tus kheej (tus kheej lub luag haujlwm lossis tus kheej ntau yam), thiab tom qab ntawd txheeb xyuas qhov xwm txheej thiab daws qhov teeb meem.
(1) Yog tias txhua lub zog tsis ua haujlwm, tsom mus rau kev kuaj xyuas lub zog hluav taws xob thiab A / D converter circuit. Thaum kuaj xyuas cov khoom siv hluav taws xob, koj tuaj yeem tshem tawm cov roj teeb laminated, nias lub hwj huam hloov, txuas qhov kev ntsuam xyuas zoo ua rau lub zog tsis zoo ntawm lub ntsuas hluav taws xob hauv qab kev sim, thiab txuas cov kev xeem tsis zoo ua rau lub zog zoo (rau digital multimeters. ), hloov qhov hloov mus rau diode ntsuas iav, yog tias cov zaub qhia Yog tias nws yog qhov hluav taws xob rau pem hauv ntej ntawm lub diode, nws txhais tau hais tias cov khoom siv hluav taws xob zoo. Yog hais tias qhov sib txawv loj, nws txhais tau hais tias muaj teeb meem nrog lub hwj huam mov. Yog tias muaj qhov qhib Circuit Court, tsom mus rau kev kuaj xyuas lub hwj chim hloov thiab cov roj teeb coj. Yog tias muaj qhov luv luv, koj yuav tsum siv txoj hauv kev sib tsoo kom maj mam txiav cov khoom siv hluav taws xob, tsom mus rau kev tshuaj xyuas cov khoom siv hluav taws xob, lub sijhawm ua haujlwm, thiab A / D converters. Yog hais tias ib qho luv luv Circuit Court tshwm sim, ntau tshaj ib qho kev sib xyaw ua ke feem ntau puas. Lub A / D converter tuaj yeem tshawb xyuas tib lub sijhawm raws li qhov ntsuas yooj yim, uas yog sib npaug rau DC meter ntawm analog multimeter. Txoj kev tshuaj xyuas tshwj xeeb yog raws li hauv qab no:
(2) Qhov ntau ntawm lub 'meter' nyob rau hauv kev sim yog tig mus rau qhov qis tshaj ntawm DC voltage;
(3) Ntsuas seb qhov ua haujlwm voltage ntawm A / D converter yog qhov qub. Raws li A / D converter qauv siv nyob rau hauv lub rooj, sib xws rau V ntxiv tus pin thiab COM tus pin, sib piv cov nqi ntsuas nrog nws cov nqi raug.
(4) Ntsuas qhov siv voltage ntawm A / D converter. Kev siv hluav taws xob ntawm cov khoom siv digital multimeter feem ntau yog 100mV lossis 1V, uas yog, DC voltage ntawm VREF ntxiv thiab COM yog ntsuas. Yog hais tias nws deviates ntawm 100mV los yog 1V, ib tug sab nraud potentiometer yuav siv tau. Ua kev hloov kho.
(5) Txheeb xyuas tus naj npawb ntawm cov tswv yim xoom, luv-circuit qhov zoo davhlau ya nyob twg IN ntxiv rau ntawm A / D converter nrog lub davhlau ya nyob twg tsis zoo IN-, kom cov input voltage Vin=0, lub meter qhia "{{ 4}} 0" or "00.00".
(6) Txheeb xyuas qhov ci ntsa iab tag nrho ntawm cov zaub. luv luv-circuit xeem davhlau ya nyob twg TEST tus pin nrog lub zoo fais fab mov davhlau ya nyob twg V ntxiv rau ua kom lub logic hauv av ua ib tug muaj peev xwm, thiab tag nrho cov digital circuits tsis ua hauj lwm. Vim hais tias DC voltage yog siv rau txhua qhov mob stroke, tag nrho cov strokes ci ntsa iab thiab cov lus sib dhos qhia "1888", thiab cov lus sib dhos qhia "18888". Yog tias tsis muaj kev cuam tshuam tsis zoo, xyuas qhov sib txuas cov zis tus pin ntawm A / D converter thiab cov kua nplaum (lossis kev sib txuas), thiab xyuas seb puas muaj kev sib cuag tsis zoo thiab kev cuam tshuam ntawm A / D converter thiab cov zaub.
3. Yog tias cov ntaub ntawv ntsuas tsis ruaj khov, thiab tus nqi ib txwm nce ntxiv, qhov chaw nkag ntawm A / D converter yog luv luv, thiab cov ntaub ntawv tso tawm tsis yog xoom, uas feem ntau tshwm sim los ntawm kev ua haujlwm tsis zoo ntawm {{ 2}}.1μF siv capacitor.
Raws li cov kev soj ntsuam saum toj no, cov kev kho yooj yim ntawm cov digital multimeter yuav tsum yog: digital meter taub hau → DC voltage → DC tam sim no → AC voltage → AC tam sim no → kuj iav (xws li buzzer thiab kuaj diode zoo voltage poob) → Cx → HFE , F, H, T, thiab lwm yam. Tab sis nws yuav tsum tsis txhob yuav heev mechanical. Qee qhov teeb meem pom tseeb tuaj yeem daws tau ua ntej. Tab sis thaum hloov kho, nco ntsoov ua raws li cov txheej txheem saum toj no.
Nyob rau hauv luv luv, ib tug faulty multimeter, tom qab kev ntsuam xyuas kom zoo, yuav tsum xub ntsuam xyuas qhov ua tau ntawm qhov txhaum, thiab tom qab ntawd nrhiav qhov chaw txhaum raws li daim duab kos rau kev hloov thiab kho. Vim hais tias cov multimeter digital yog cov cuab yeej siv tau zoo, cov khoom siv hloov pauv yuav tsum tau hloov los ntawm cov khoom siv nrog tib yam tsis zoo, tshwj xeeb tshaj yog kev hloov pauv ntawm A / D converter, yuav tsum siv cov kev sib xyaw ua ke uas tau soj ntsuam nruj me ntsis los ntawm cov chaw tsim khoom, txwv tsis pub muaj ua yuam kev thiab yuav tsis ua raws li qhov yuav tsum tau ua. Qhov tseeb. Cov hloov tshiab A/D hloov tshiab kuj yuav tsum tau kuaj xyuas raws li cov txheej txheem tau piav qhia saum toj no, thiab yuav tsum tsis txhob ntseeg vim yog qhov tshiab.
Tam sim no, muaj ntau lub tuam txhab tsim khoom siv digital multimeters, thiab qhov zoo kuj tseem zoo thiab tsis zoo. Nws tsis yog ib qho yooj yim kom pom cov teeb meem zoo ntawm ob sab tooj liab-clad laminates thaum kho. Thaum lub rwb thaiv tsev lub zog ntawm lub rooj tsavxwm resin tsis txaus, nws yog feem ntau tshwm sim nyob rau hauv qhov yuam kev loj thaum ntsuas qhov hluav taws xob siab, thiab kev kho yuav tsum txawv ntawm qhov kev hloov pauv ntawm qhov voltage divider resistor. Nyob rau hauv rooj plaub no, nws yog qhov zoo tshaj plaws los siv txoj kev qhib Circuit Court kom pom qhov txhaum. Cov burnt thiab carbonized qhov chaw yuav tsum tau muab ntxuav kom tau raws li qhov yuav tsum tau rwb thaiv tsev. Thaum lub teeb liab tawm tswv yim tsis tuaj yeem tawm tswv yim vim qhov tawg ntawm qhov hloov pauv ntawm ob sab kev sib txuas, nws yooj yim kom tsis meej pem nrog qhov hloov pauv tsis zoo thiab nyuaj rau kev sib cais. Rau hom kev txhaum no, txoj kev luv luv yuav tsum tau siv los nrhiav qhov txhaum.
